Mission: Yozakura Family (2019)

Taiyou Asano is a high schooler who has been socially inept ever since his family died in a car accident. The only person he can ever talk with properly is Mutsumi Yozakura, his childhood friend, who also happens to be the head of the world's strongest family of spies. Mutsumi's eldest brother, Kyouichirou Yozakura, has been overprotective of her since she was severely injured. His love for Mutsumi is lethal, and Taiyou is his next target.